package main

import "fmt"

func main(){

	var a int = 21
	var b int = 10
	var c int
	
	c = a+b
	fmt.Printf("c = %d \n",c)
	c = a-b
	fmt.Printf("c = %d \n",c)	
	c = a*b
	fmt.Printf("c = %d \n",c)
	c = a/b
	fmt.Printf("c = %d \n",c)
	c = a%b
	fmt.Printf("c = %d \n",c)	
	a++
	fmt.Printf("a = %d \n",a)
	a = 21
	a--
	fmt.Printf("a = %d \n",a)
}